A United Airlines passenger was arrested after he allegedly tried to open an emergency exit door while aboard the plane and then allegedly tried to stab a flight attendant, according to the U.S. Attorney's Office in Massachusetts.

The incident took place during a Sunday flight from Los Angeles to Boston.

<em>This is a developing story. Please check back for updates.</em>

A passenger has been arrested after he allegedly tried to open an emergency exit door on a United Airlines flight.

Passenger allegedly tries to stab flight attendant, open emergency door

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